Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1982-06-17
1984-05-01
Birmiel, Howard A.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73846, G01N 324
Patent
active
044453876
ABSTRACT:
A compression shear test jig for determining the internal shear strength of the weakest plane of a wood fiber or particle panel product. The test jig comprises an upper and lower loading head adapted to be used in conjunction with a universal testing machine or press. The upper and lower loading heads are each provided with a sample engaging face disposed at substantially a 45.degree. angle. These faces are in parallel spaced apart relation. The bottom end of the lower face and top end of the upper face are each provided with a sample restraining element. The lower head body includes a base which rests upon a low friction surface permitting unrestrained lateral movement to occur as shear strain develops. Preferably the upper loading head includes a pivoted cap so that compressive force is applied uniformly. The sample engaging faces are preferably formed in separable face plates which are adjustable relative to the loading head bodies to compensate for samples of different thicknesses. The preferred low friction surface is formed by the upper edges of a plurality of parallel rollers. In use, a test specimen is placed between the opposed sample engaging faces and a measured compressive force is applied until the specimen shears.
REFERENCES:
Gaudert, P. 1974, New Torsion Test for Particleboard, Forest Products Journal, 24(2):35-37.
Gertjejansen, R. and Haygreen, J. 1971, Torsion Shear Test for Particleboard Adapted to a Universal Testing Machine, Forest Products Journal, 21(11):59-60.
Heebink, B. and Gatchell, C. 1965, A Proposed Plug Tension Test for Particleboard, Forest Products Journal, 15(1):28-30.
Kufner, M. 1975, Die Prufung der Bindefestigkeit von Spanplatten (Testing the Binding Strength of Particleboard), Holz als Roh-und Werkstoff, 33(1975):265-270.
Lehmann, W. 1965, Simplified Test of Internal Bond in Particleboard, Forest Products Journal, 15(5):223-224.
Liiri, O., Kivisto, A., Tuominen, M. and Aho, M. 1980, Determination of the Internal Bond of Particleboard and Fiberboard, Holz als Roh-und Werkstoff, 38(1980):185-193.
Shen, K. et al., 1969, Compression Shear Strength of Particleboard and its Relationship to Internal Bond, Department of Fisheries and Forestry, Canadian Forestry Service, F.P.L. Ottawa, Ontario, Information Report OP-X-22, 15 pp.
Shen, K. and Carroll, M. 1969, A New Method for Evaluation of Internal Strength of Particleboard, Forest Products Journal, 19(8):17-22.
Shen, K. 1970, Correlation Between Internal Bond and the Shear Strength Measured by Twisting Thin Plates of Particleboard, Forest Products Journal, 20(11):16-20.
Suchsland, O. 1977, Compression Shear Test for Determination of Internal Bond Strength in Particleboard, Forest Products Journal, 27(1):32-36.
Passialis, C. and Tsoumis, G. 1982, Method for Testing Internal Bond of Particleboard, Wood and Fiber, 14(2):159-161.
Hall Henry J.
Haygreen John G.
Birmiel Howard A.
Regents of the University of Minnesota
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